The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:3227 advisory.

    The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and     customizable boot loader with modular architecture. The packages support a variety of kernel formats, file     systems, computer architectures, and hardware devices.

    The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot     loader under secure boot environments.

    The fwupd packages provide a service that allows session software to update device firmware.

    Security Fix(es):

    * grub2: Crafted grub.cfg file can lead to arbitrary code execution during boot process (CVE-2020-10713)

    * grub2: grub_malloc does not validate allocation size allowing for arithmetic overflow and subsequent     heap-based buffer overflow (CVE-2020-14308)

    * grub2: Integer overflow in grub_squash_read_symlink may lead to heap-based buffer overflow     (CVE-2020-14309)

    * grub2: Integer overflow read_section_as_string may lead to heap-based buffer overflow (CVE-2020-14310)

    * grub2: Integer overflow in grub_ext2_read_link leads to heap-based buffer overflow (CVE-2020-14311)

    * grub2: Fail kernel validation without shim protocol (CVE-2020-15705)

    * grub2: Use-after-free redefining a function whilst the same function is already executing     (CVE-2020-15706)

    * grub2: Integer overflow in initrd size handling (CVE-2020-15707)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:3271 advisory.

    The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and     customizable boot loader with modular architecture. The packages support a variety of kernel formats, file     systems, computer architectures, and hardware devices.

    The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot     loader under secure boot environments.

    The fwupdate packages provide a service that allows session software to update device firmware.

    Security Fix(es):

    * grub2: Crafted grub.cfg file can lead to arbitrary code execution during boot process (CVE-2020-10713)

    * grub2: grub_malloc does not validate allocation size allowing for arithmetic overflow and subsequent     heap-based buffer overflow (CVE-2020-14308)

    * grub2: Integer overflow in grub_squash_read_symlink may lead to heap-based buffer overflow     (CVE-2020-14309)

    * grub2: Integer overflow read_section_as_string may lead to heap-based buffer overflow (CVE-2020-14310)

    * grub2: Integer overflow in grub_ext2_read_link leads to heap-based buffer overflow (CVE-2020-14311)

    * grub2: Fail kernel validation without shim protocol (CVE-2020-15705)

    * grub2: Use-after-free redefining a function whilst the same function is already executing     (CVE-2020-15706)

    * grub2: Integer overflow in initrd size handling (CVE-2020-15707)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Bug Fix(es):

    * grub2 should get resynced with 7.8 branch (BZ#1861857)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the grub2 packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - A flaw was found in grub2, prior to version 2.06. An     attacker may use the GRUB 2 flaw to hijack and tamper     the GRUB verification process. This flaw also allows     the bypass of Secure Boot protections. In order to load     an untrusted or modified kernel, an attacker would     first need to establish access to the system such as     gaining physical access, obtain the ability to alter a     pxe-boot network, or have remote access to a networked     system with root access. With this access, an attacker     could then craft a string to cause a buffer overflow by     injecting a malicious payload that leads to arbitrary     code execution within GRUB. The highest threat from     this vulnerability is to data confidentiality and     integrity as well as system     availability.(CVE-2020-10713)

  - Integer overflows were discovered in the functions     grub_cmd_initrd and grub_initrd_init in the efilinux     component of GRUB2, as shipped in Debian, Red Hat, and     Ubuntu (the functionality is not included in GRUB2     upstream), leading to a heap-based buffer overflow.
    These could be triggered by an extremely large number     of arguments to the initrd command on 32-bit     architectures, or a crafted filesystem with very large     files on any architecture. An attacker could use this     to execute arbitrary code and bypass UEFI Secure Boot     restrictions. This issue affects GRUB2 version 2.04 and     prior versions.(CVE-2020-15707)

  - GRUB2 contains a race condition in     grub_script_function_create() leading to a     use-after-free vulnerability which can be triggered by     redefining a function whilst the same function is     already executing, leading to arbitrary code execution     and secure boot restriction bypass. This issue affects     GRUB2 version 2.04 and prior versions.(CVE-2020-15706)

  - There is an issue with grub2 before version 2.06 while     handling symlink on ext filesystems. A filesystem     containing a symbolic link with an inode size of     UINT32_MAX causes an arithmetic overflow leading to a     zero-sized memory allocation with subsequent heap-based     buffer overflow.(CVE-2020-14311)

  - There is an issue on grub2 before version 2.06 at     function read_section_as_string(). It expects a font     name to be at max UINT32_MAX - 1 length in bytes but it     doesn't verify it before proceed with buffer allocation     to read the value from the font value. An attacker may     leverage that by crafting a malicious font file which     has a name with UINT32_MAX, leading to     read_section_as_string() to an arithmetic overflow,     zero-sized allocation and further heap-based buffer     overflow.(CVE-2020-14310)

  - There's an issue with grub2 in all versions before 2.06     when handling squashfs filesystems containing a     symbolic link with name length of UINT32 bytes in size.
    The name size leads to an arithmetic overflow leading     to a zero-size allocation further causing a heap-based     buffer overflow with attacker controlled     data.(CVE-2020-14309)

  - In grub2 versions before 2.06 the grub memory allocator     doesn't check for possible arithmetic overflows on the     requested allocation size. This leads the function to     return invalid memory allocations which can be further     used to cause possible integrity, confidentiality and     availability impacts during the boot     process.(CVE-2020-14308)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote SUSE Linux SLES11 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2020:14440-1 advisory.

  - A flaw was found in grub2, prior to version 2.06. An attacker may use the GRUB 2 flaw to hijack and tamper     the GRUB verification process. This flaw also allows the bypass of Secure Boot protections. In order to     load an untrusted or modified kernel, an attacker would first need to establish access to the system such     as gaining physical access, obtain the ability to alter a pxe-boot network, or have remote access to a     networked system with root access. With this access, an attacker could then craft a string to cause a     buffer overflow by injecting a malicious payload that leads to arbitrary code execution within GRUB. The     highest threat from this vulnerability is to data confidentiality and integrity as well as system     availability. (CVE-2020-10713)

  - In grub2 versions before 2.06 the grub memory allocator doesn't check for possible arithmetic overflows on     the requested allocation size. This leads the function to return invalid memory allocations which can be     further used to cause possible integrity, confidentiality and availability impacts during the boot     process. (CVE-2020-14308)

  - There's an issue with grub2 in all versions before 2.06 when handling squashfs filesystems containing a     symbolic link with name length of UINT32 bytes in size. The name size leads to an arithmetic overflow     leading to a zero-size allocation further causing a heap-based buffer overflow with attacker controlled     data. (CVE-2020-14309)

  - There is an issue on grub2 before version 2.06 at function read_section_as_string(). It expects a font     name to be at max UINT32_MAX - 1 length in bytes but it doesn't verify it before proceed with buffer     allocation to read the value from the font value. An attacker may leverage that by crafting a malicious     font file which has a name with UINT32_MAX, leading to read_section_as_string() to an arithmetic overflow,     zero-sized allocation and further heap-based buffer overflow. (CVE-2020-14310)

  - There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem     containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a     zero-sized memory allocation with subsequent heap-based buffer overflow. (CVE-2020-14311)

  - GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability     which can be triggered by redefining a function whilst the same function is already executing, leading to     arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2 version 2.04 and     prior versions. (CVE-2020-15706)

  - Integer overflows were discovered in the functions grub_cmd_initrd and grub_initrd_init in the efilinux     component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu (the functionality is not included in GRUB2     upstream), leading to a heap-based buffer overflow. These could be triggered by an extremely large number     of arguments to the initrd command on 32-bit architectures, or a crafted filesystem with very large files     on any architecture. An attacker could use this to execute arbitrary code and bypass UEFI Secure Boot     restrictions. This issue affects GRUB2 version 2.04 and prior versions. (CVE-2020-15707)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

An update of the grub2 package has been released.

The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2022:0064 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2020-10713:
    A flaw was found in grub2, prior to version 2.06. An attacker may use the GRUB 2 flaw to hijack and tamper     the GRUB verification process. This flaw also allows the bypass of Secure Boot protections. In order to     load an untrusted or modified kernel, an attacker would first need to establish access to the system such     as gaining physical access, obtain the ability to alter a pxe-boot network, or have remote access to a     networked system with root access. With this access, an attacker could then craft a string to cause a     buffer overflow by injecting a malicious payload that leads to arbitrary code execution within GRUB. The     highest threat from this vulnerability is to data confidentiality and integrity as well as system     availability.

    CVE-2020-14308:
    In grub2 versions before 2.06 the grub memory allocator doesn't check for possible arithmetic overflows on     the requested allocation size. This leads the function to return invalid memory allocations which can be     further used to cause possible integrity, confidentiality and availability impacts during the boot     process.

    CVE-2020-14309:
    There's an issue with grub2 in all versions before 2.06 when handling squashfs filesystems containing a     symbolic link with name length of UINT32 bytes in size. The name size leads to an arithmetic overflow     leading to a zero-size allocation further causing a heap-based buffer overflow with attacker controlled     data.

    CVE-2020-14310:
    There is an issue on grub2 before version 2.06 at function read_section_as_string(). It expects a font     name to be at max UINT32_MAX - 1 length in bytes but it doesn't verify it before proceed with buffer     allocation to read the value from the font value. An attacker may leverage that by crafting a malicious     font file which has a name with UINT32_MAX, leading to read_section_as_string() to an arithmetic overflow,     zero-sized allocation and further heap-based buffer overflow.

    CVE-2020-14311:
    There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem     containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a     zero-sized memory allocation with subsequent heap-based buffer overflow.

    CVE-2020-15705:
    GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be     bypassed. This only affects systems where the kernel signing certificate has been imported directly into     the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects     GRUB2 version 2.04 and prior versions.

    CVE-2020-15706:
    GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability     which can be triggered by redefining a function whilst the same function is already executing, leading to     arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2 version 2.04 and     prior versions.

    CVE-2020-15707:
    Integer overflows were discovered in the functions grub_cmd_initrd and grub_initrd_init in the efilinux     component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu (the functionality is not included in GRUB2     upstream), leading to a heap-based buffer overflow. These could be triggered by an extremely large number     of arguments to the initrd command on 32-bit architectures, or a crafted filesystem with very large files     on any architecture. An attacker could use this to execute arbitrary code and bypass UEFI Secure Boot     restrictions. This issue affects GRUB2 version 2.04 and prior versions.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2020:4115 advisory.

    The redhat-virtualization-host packages provide the Red Hat Virtualization Host. These packages include     redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. Red Hat Virtualization Hosts (RHVH)     are installed using a special build of Red Hat Enterprise Linux with only the packages required to host     virtual machines. RHVH features a Cockpit user interface for monitoring the host's resources and     performing administrative tasks.

    The ovirt-node-ng packages provide the Red Hat Virtualization Host. These packages include redhat-release-     virtualization-host, ovirt-node, and rhev-hypervisor. Red Hat Virtualization Hosts (RHVH) are installed     using a special build of Red Hat Enterprise Linux with only the packages required to host virtual     machines. RHVH features a Cockpit user interface for monitoring the host's resources and performing     administrative tasks.

    The following packages have been upgraded to a later upstream version: redhat-release-virtualization-host     (4.3.11), redhat-virtualization-host (4.3.11). (BZ#1868307, BZ#1878044)

    Security Fix(es):

    * grub2: Crafted grub.cfg file can lead to arbitrary code execution during boot process (CVE-2020-10713)

    * QEMU: usb: out-of-bounds r/w access issue while processing usb packets (CVE-2020-14364)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
139192	RHEL 8 : grub2 (RHSA-2020:3227)	Nessus	Red Hat Local Security Checks	7/30/2020	11/7/2024	high
139288	RHEL 7 : grub2 (RHSA-2020:3271)	Nessus	Red Hat Local Security Checks	8/3/2020	11/7/2024	high
147445	EulerOS Virtualization 2.9.1 : grub2 (EulerOS-SA-2021-1601)	Nessus	Huawei Local Security Checks	3/10/2021	1/11/2024	high
150632	SUSE SLES11 Security Update : grub2 (SUSE-SU-2020:14440-1)	Nessus	SuSE Local Security Checks	6/10/2021	12/26/2023	high
203108	Photon OS 3.0: Grub2 PHSA-2020-3.0-0120	Nessus	PhotonOS Local Security Checks	7/23/2024	7/24/2024	high
276403	TencentOS Server 3: grub2 (TSSA-2022:0064)	Nessus	Tencent Local Security Checks	11/20/2025	11/22/2025	high
141087	RHEL 7 : redhat--virtualization-host and redhat-virtualization-host (RHSA-2020:4115)	Nessus	Red Hat Local Security Checks	9/30/2020	11/7/2024	high

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